Actually a big game company that is working on serious base will sure buy a Model but they will by the full ownership, avoiding later issues. If you buy a Licence to make a render then you are allowed to use the model in the render but you do not own the model, causing that you can't claim full rights on the Image you produced, you might own the story but not the character, at this point it is difficult having your Image registrated under full ownership in a copyright office. One might ask, who is that character, your response, Victoria, question, whom belongs Victoria? Sure the render is yours, your collage,  but you are not the intellectual owner of the whole. The more premade stuff you use the less it is that you are the legitime creator. Unless the creator gives unrestricted permissions of usage on derivative works and usage of the Models. but sure is not the case with stuff you buy for Poser DS.

If you go hardcore, you use La Femme make a render with her and name her "Aisha" is it then Aisha or is it La Femme you used ? So no matter how many Morph Packages you will create to sell, no matter how you will name these it will always be la femme and the Intellectual owner of this character will always be the creator, no matter how and for what you will use it. It will just be a derivative of the base in witch you only own a basic Licence of usage. 

A simple question ? What is it that you really own on your Computer ? Do you actually own any part of it ? I guess not, sometimes I even wonder if we own our own flesh or if someone is calming rights on it :)